Three-dimensional nonlinear coupling guidance for hypersonic vehicle in dive phase

• Published in: Science China. Technological sciences Vol. 57; no. 9; pp. 1824 - 1833
• Main Authors: Zhu, JianWen, Liu, LuHua, Tang, GuoJian, Bao, WeiMin
• Format: Journal Article
• Language: English
• Published: Heidelberg Science China Press 01.09.2014
• Subjects: Control systems; Diving; Engineering; Guidance (motion); Hypersonic vehicles; Joining; Mathematical analysis; Nonlinearity; Three dimensional; 三维; 俯冲; 混合控制策略; 滑动模式控制; 状态空间方程; 非线性耦合; 高超声速飞行器; 高超音速飞机; hybrid control strategy; slide mode control; coupling; feedback linearization; hypersonic vehicle; 3D diving guidance
• ISSN: 1674-7321; 1869-1900
• DOI: 10.1007/s11431-014-5615-0

Three-dimensional （3D） nonlinear diving guidance strategy considering the coupling between longitudinal and lateral motions for hypersonic vehicle is investigated in this paper. It constructs the complete nonlinear coupling motion equation without any approximations based on diving relative motion relationship directly, and converts it into linear state space equation with the same relative degree by feedback linearization. With the linear equation, slide mode control with strong robustness is em- ployed to design the guidance law, and 3D diving guidance law which can satisfy terminal impact point and falling angle con- straints with high precision is obtained by substituting the previous control law into the origin nonlinear guidance system. Be- sides, regarding lateral overload as the standard, hybrid control strategy which can take full advantage of the excellent charac- ters of both bank-to-turn （BTT） and skid-to-turn （STT） controls is designed to improve the guidance accuracy further. Finally, the results of CAV-H vehicle guidance test show that the algorithm can realize high accuracy guidance even if serious motion coupling exists, and has strong robustness to the path disturbances and navigation errors as well.